Fixes this:
In file included from libpthread/nptl/pthread_create.c:48:0:
libpthread/nptl/allocatestack.c: In function 'allocate_stack':
libpthread/nptl/allocatestack.c:602:6: warning: label 'mprot_error' defined but not used [-Wunused-label]
mprot_error:
^~~~~~~~~~~
Signed-off-by: Yann Sionneau <ysionneau@kalray.eu>